This experiment is an example of hypothesis-based science. What question did the researchers ask? What question did the researchers ask? Do male guppies in pools with pike-cichlid fish have brighter color patterns than females in the pool? Do female guppies prefer to mate with males with bright color patterns or drab colors? Can predation result in selection for color patterns in guppies? Do killifish prefer to prey on juvenile guppies or adult guppies?